Aircraft Communications Testing

VHF Radios (Very High-Frequency):

• • • • VHF radio communication is the most common method for pilot-controller interactions.
      • The airband frequency range (108 MHz to 137 MHz) is allocated for civil aviation.
      • Pilots tune radios to specific frequencies for voice communication with air traffic control (ATC) and other aircraft.
      • Ground control frequencies are typically on the 121 MHz band.
      • The guard frequency is 121.5 MHz, used for emergency distress calls.

• • • ACARS allows direct communication between pilots, dispatchers, and company personnel.
    • It operates via datalink communication, enabling messages related to flight status, weather updates, and maintenance issues.
    • Pilots can interact with ACARS while in the air and on the ground.

CPDLC (Controller-Pilot Data Link Communications):

• • • • CPDLC enables text-based communication between pilots and ATC.
      • Used for non-urgent messages, clearances, and requests.
      • Common in oceanic and remote airspace.

• • • HF systems provide long-distance voice communication.
    • Used for overwater flights and remote regions where VHF coverage is limited.
    • Frequencies range from 2 MHz to 30 MHz.

SELCAL (Selective Calling):

• • • • SELCAL allows ATC to selectively call specific aircraft using HF or VHF.
      • Pilots receive a unique code, and when ATC wants to communicate, they activate the corresponding alarm in the cockpit.

• • • SATCOM systems use satellites for voice and data communication.
    • Commonly used for oceanic flights and remote areas.
    • Enables real-time communication with dispatchers and other ground personnel.

Functional Testing

• • • • Regularly testing the radio communications systems of an aircraft is essential to its performance.
      • Test systems like the ARTS-7000 can transmit radio signals to the aircraft under test that simulates ground stations, controllers, or other aircraft.
      • These tests will ensure aircraft comms systems are performing to spec.